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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbea9b7e26cec42229ab368f3f657aa0ec05efb496e28dd501dccd4eab28cc27' 
  AND token = 's/KlRv6J/RuDty/5WINPUFjWlVLRUM6DcDz+fzlNvus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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