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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ef21c98fb093392b922bef2f7494987ff911c4575a24fd530f6b795ee4d0f18' 
  AND token = 'gprWsv2Jp0ouNQaaDcaWDgILD2fB66HUaPCtzWTvkOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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