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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57ebced48c92f796b2362a91258a9a9a55db75dae1aa3bb848d9d2b92d2621d7' 
  AND token = 't91yvCTtFwfBvlfyABx2S0TQqJPUgvcK8XKsRi1ISdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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