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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45559abebb25e4cecc8f07692befacd2785fa0af4a3f63bc04c89a560c59c85f' 
  AND token = 'dSzR7qKMUKlEC4Kx4YjhtjizNzZ9N1+PHZf8x/ynjiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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