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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '215171e690a8528b68a0f65fe31493b129283b9836b0ac97f08990ad9ba90fa1' 
  AND token = 'KEs+nFSOlBCwDT4MC32+ALO54Eaeqrorin5l8drTsUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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