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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '064446a58f8609129a8d5e96510c86042c0e7d6f3066bc20bb98ab574707e7b7' 
  AND token = '6JcC2HLtrPcM3z3T+OmVuJrFz+e+0InkG4tRa1byWvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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