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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6d1e4bf996d3a3bb80061b2ed822da4cde31891c31f593e49c6d20fca16661a' 
  AND token = 'ts924RoJi/ItBVIu943qQ/1eP4pz/eZm3qFTe35WfUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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