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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a5cdc3f7e2e6d2c63c3e9702e0b6d8599e0b05645d4c0c1d5b31508d050ed80' 
  AND token = '0fzoJQI/g89uakMDZ86kwLUPfrdMWmHbQLRs4IXX4Bg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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