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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f80fe667e24db945b24ad581ca66b65ad63186a8c3589c42c3b791248dd9b94c' 
  AND token = 'PF6A2L+d91Ocj03HEbluXRRDEpgItp/7g30KL7JXgBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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