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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '878c12fcce573f9ce43421268a3a46a91b3a1993544f55bc94aca42e7f5ad974' 
  AND token = 'tjjeCE8IIxH5DNEjAeFSLB3yOzn5vjDL1l1hZl+Vu2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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