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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15f58e91b7a4db128ada4250a92d1983475ac0e62f42423944165cd09d253b91' 
  AND token = '/5gQEERtz+WW1/1Rrt54+yXPOg9pjZSVJyQ/YlPZ0D4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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