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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4995e321c8155c48e54b7817a39ddf7d1bc0ac458fcb3af3d2e58ad66f8cde9a' 
  AND token = 'fCdSfrW81vquqTmra3vbBX21A/KgkJ50B+0f7XS25gE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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