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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6f60ddbe395e238a93f010b50357ce326efca4fe4faa68eae561d237fb843aa' 
  AND token = 'uu/L54YPNaaJCiVWU04MzpbsRh0vEjQnsnTWST4FxEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}