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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd3e2508dc3d1c7e961543a0dd7428afc52733d4b52374dd701dfa61a5cba69f' 
  AND token = 'mwMhht8jcT0l1YW7Ms9ggTmE9TE7cDUOhT9RyrTSnH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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