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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '156d4c780cecc9df5f0987628844f5bdeecd65e474ad1b00fc775716ba56ad82' 
  AND token = 'r/ONlA4LIECZi6PJfr55RQ/geBGqUkodQnIYbekWGB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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