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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ef3e4b0078e4a515b064ddfa06db9f7c7acc39d1f20dfff776bd5f3e12d61f4' 
  AND token = 'yhTPmKgnLhmpuddJk4fwFEtk4snW/vVXFMk126XyaaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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