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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e33053fd615272ffb3b83692d3b166e85f1b4d496409631a5e95010e38e8b04' 
  AND token = 'PMxNJIwDNbl+hyJ+0Tuq36seMTlBGZwEjkyiozVkvjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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