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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f07448570d05a5c18ec31deaf6e7a561d202045552537fdc08f28971d8828435' 
  AND token = 'jm61N40C/nNTcnPMZMmdZK3FT/lU3Q4sa25NBSlfYdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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