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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e29800c5f872f07847fac6e2b15f3817ecff37a24fb8ae57f2a0aa48caf0b5d2' 
  AND token = 'hAX+1cp5NGb6WHesu8szmDGAXH9GLHxREEsBdgSxr60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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