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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd509d67b05f7f2c84db6b3145b18d3884e15a0c91357d74adf9baccb9e6b07e' 
  AND token = 'Wg6Jg76BRh2oC4w8DU/i5vjTZHM15p0RtCT3jiKeBI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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