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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4846dc9e7339566c03b2e4831ffa995826aff1f932d1bcb52f82445139ca5fcd' 
  AND token = 'yhVIwRfd9cnaEL8TcGFnKZXpM0ighP4R/Kr3ucMlijI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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