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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '039cab51734d0a5ab72dbf38e3882128426af349c17eab2555cfb82e93ce6318' 
  AND token = 'GhZdMcvB3ZMERjr3v2lcFDmJ8u+lv4mgI+ceVrrL9PA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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