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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ddc1961c8b78a26763e0910a579139eb0d755f5b0240cbc8e5ee444701e56d4' 
  AND token = 't/RZ7Gdhkv5zxBIMemE6zFxLoYeBHAMM2+5+Tjwo99I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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