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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ee552da579cf8d3891cf74d1973a3e3db57985f079680893cb8fa0ddf23e52d' 
  AND token = 'k/Hkqo+YlEn/vnpB3Tc1a7wBuD3u5oIF+n2B+QDgcA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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