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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ac200ebc2574366c214f81ab0ffd2003d9d2fe2ff088768fbc5c63a624ad7bd' 
  AND token = 'vTf2/vERCK3GKGbpZmEH0gNahKZZz9kx/+Fa1buyy54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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