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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cee10648ef52d20df658a1187efbf8798d582469a3dfa0a617e888bbb81d2c2f' 
  AND token = 'koOPjN/EcsChD1ERO2iV5QuJV6YucmuqqV3xJz/IK2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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