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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b214a20abce3f38bb7462aee7519c7a9a76f0fd8ce425fa9beaf01c5a4a9b0f8' 
  AND token = 'Xq8nTHlb8xCmSyM7qko66n1PYFE0GJbl7eSG2O0jRXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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