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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08ed13152ddd152597b595beab9681b5e33df773026c160be499b759c3c1580e' 
  AND token = 'G31hQ/aqbGg2DFnUsUp6njGG+nP8YkTj6Iwya+19ZPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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