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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c340d73dddd68fd10eac2e8d23cb400cc6e55cb737b66ea4b015ef15a9ea5cfd' 
  AND token = 'qefQ9IFsZFzZj4xgkVMhlktiUn7XA3QHEMXWkKVOCu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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