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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '179a11fbb5befaf36456cea4df3ec64ce442c6279d1e5b596e56874622b30462' 
  AND token = 'j/fYWZ53QFKS9E6wEBoZxXMk7WoYkD8stuN46X+h3Yc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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