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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e8ec738185610ae9c0e999750162220f022e5cafc55629bd788837677641798' 
  AND token = 'etD17B1nQkakEDLw4uYF/3oqIXpxkmVnVYbzSy7F+LQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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