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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19fec70a83de206c3ffeab59caf9e0c7428aa21c073d88663c97eaa9f9a4f59b' 
  AND token = 'pj1mt7aGlzaaGWA80T+pF6vq3cb/cyzvsWdXykgvvxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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