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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a522c5fdc88c842cddd861436476e731184526a2c3fcddad829976d3c3d8533' 
  AND token = '5/YtvRTz05oA+1FNRgY9Fw4KBqB8RbK26yElnas332k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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