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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '736336de527e0f9de9a1e8e2b31ece9c9f82d17da1c1c608ce916b383b4da8bb' 
  AND token = 'twnaV6cHP+aUB7nWwM3T1Vsw9cSzmO9mETVQWubgd0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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