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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcbd73f199d310771ae48fd947cd7d1569beddfaaa4b04312a4a4b0cb91632ca' 
  AND token = 'bliWF32n6eDvnw0Alr4H9gYpSIVIwvcBCN+WRAzsW4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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