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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd090adf26aa6b0d116aa72c7e51a5a99abb2947d71f1dcb896b1d658d13464c6' 
  AND token = 'PME9sIXuLTn9gDk3r1heYrRBgKTPg3CdO1StKaswbAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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