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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64c8225c4c1a3f55ad0b0a5c02b0d74b1698e3000f13ece8f827c5b1b6d1fa29' 
  AND token = '+f09CadUuFVOgaaxlm8wmsAf9Dfvw+O2gDFFTdaaOH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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