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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51dee1e3a14792701a8d2e7b6d4d39ee9d16c0a70324acc18474140b32e48a51' 
  AND token = 'lsffGKcDyVUirVNJLyl/gi2cn3g2Xa/k/d/Gt5xq9rk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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