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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72437b06fa32a618ec2cda737a03b5c0b9ea09960df536e0a78a056846be4434' 
  AND token = 'D7q0rveSQb5XaBm7y6j5ch1w4GAZMfOC9ksVC+JVEew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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