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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77107ef6f737a4a8860e0c85bc5dc637db3fe0aa2e994677bdb5f567dec166e0' 
  AND token = 'I1USMxvUzkxxnt1TizDl5wg02s1UB3q2fPPsr0Omkm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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