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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f556ddc1c2981a3a0f4ee7673dcc59c0e0e4d4f7b1ce9d67a8eb8f5dd687a9d6' 
  AND token = 'a+qcKOymOMyoZiORQmXV72rgCRnOhuN/kqBHw5EoA50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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