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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f361b97e0cce329a3f8d8363e19afd795a65b7902d27b42aaa4e98575cd3983' 
  AND token = 'HRH2onY3SN2Kni9ePZwW1LAKmsT5JI3xEUh1k/BmupQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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