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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fea7339f635d3c6ad66ae20d9aeb7ce5a86181eea30746ca353d5a7240c4221e' 
  AND token = 'NBlNSIgSpzsJbkMaD3OVhMIACzmMpMHVpQdFQ6A19/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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