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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3845b1af34361490fa8e83df7f2ab2dce54c4c77bb4a3b057467f845f29cfc11' 
  AND token = 't9bZPVBwshjEMJkc6xmI1EoWxDPVppk7Uc4R4bVbGlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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