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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34a0e26fca241478a7cfba14077319bd01d4a16388f0f1f4b395492b2858e3de' 
  AND token = 'ujGEMwBajsgYs2aP5lgta5kYSS/G4VW8E0lZvrAwio0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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