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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de2965c72ec5911148e0274853f3f30ee8ce2a6e111de495305638f4f459048c' 
  AND token = 'QPLyVvGiuxikukIVoHpOdZdAP7Gdwo7kWgpUHNGJbK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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