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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7af0e5555a46f086d4281ad60385c02c2150e0326571bbccd6499b82fba19081' 
  AND token = '8lD6ufIQ8pb1l3r+nSc1FVE0K0O8VOeKxEox3+YVJRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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