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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bc6d9384cdeef2cc7f4dacb0703721826aa640c77a4b0cd65ec7cbb46d548be' 
  AND token = '0FQOrfa+18B4RuFcrfUhh9ygK8+NHl031Kj4bAJemQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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