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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a1fb21bbf22dbb9bbd3cd98dde6fe5b09ac074fba6abffc0afab3dcd001c3c7' 
  AND token = 'u+mMmeIaoD+3Ln2YxRo477B1nTZHYgyoXPhy2ckLi9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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