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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cbc573ef0fec30b151d6941f7c1781d9a559c8cff6d951ec987f6ca8a6099d8' 
  AND token = 'v7UR67ENlRNxPxTdddcHDxabH2vns8X4h/pnETRiKcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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