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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb87948bb223978f2e1e99131ffb88cd91ec0e66c2ac7480451c87ca095b889d' 
  AND token = 'bbBTwqkGsHrXcWY6ry2+gUAgCVXh2WokHF5lG3Jm8ho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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