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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fce74cf63d9b31c0ec4c1202ab751c17e9a59cb9c11685abe43f1211e14ba6cf' 
  AND token = 'M+seKiUBX603ha+Naq2sa7MMgmcF8UnTUlzzMqeDaUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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