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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7f9787095e75a256f241b6d2ce154fd7d5c02cf88c403503f3643e67b81b3e2' 
  AND token = 'AsEOHl/Y4Y+xoyi91voviy3cPa5PcXlTCS7QrSqfN28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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