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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9976ade7c6e76d7dae7d14c04e394aa19456fe14cde0195afd486ba1928efedb' 
  AND token = 'm8Ek566UstsuZGlBXImfKZcsb2cNIQmfvDQelOTiAnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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