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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c8f3dac15c39ed68bd4ab98ef362b3b2f18510abf725ae40edf81fca64f269b' 
  AND token = '8Oh/D1/iFiat6McTOS/REOnqAbsyxqMSMwATcIqWNrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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