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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5354106ed394de0e2f5f81dcf7579b6397c5541ed2bb45f7d673e9cb1f4103fd' 
  AND token = 'pEOpGodk6vnq5at+gaCLS438GUF/a2p+a72Zc6g3/kI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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