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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7180b5f067f5d864453cbbbff62fa3b4d0dada14e3011dc222e29847e7008478' 
  AND token = '0h85bVnu2cyzccYGKeEYjk7/prKcyX9Z2wn465cK8Wo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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