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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92adb7bf00089b12408a7d512be327e9186880dd1a0d9d444e2dadcfe6913d22' 
  AND token = 'SElJKT8dGhvD723b3yG4SwNg0hJtlIqPtPjtA+SmoDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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