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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f48e90b605f8c301a6bade1db57b75e072d72c5fd1397c2cc32cb1c1b6c88fe' 
  AND token = 'xa5C2B6tz063pXAOUQuENYEwD9/hxkZya2Ie6y74iKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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