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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14b87a47d26ef639585d8ab1ce7cdf14f1cd4499f13c735291f623821a45b3a8' 
  AND token = '3qv8U64bfo9xxgbnsA2cWb56jM80qR1g9kc+/G8kZZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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