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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fb7ff2ba55c3a727ffcc7168ef2d8d697bb015500aaa85250633ea6e015d1de' 
  AND token = 'Qyx+69DLpo/KFvE+6xjCJPuiHe5uxqlCmpmwPI/CgG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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