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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84b0e9ba0efe60c16a526a17cfbc0169511244fd1ba9cc6915b5f9c01f6a90fc' 
  AND token = 'LHAFNfot/HGfE/qXNNfxeG8VaYdLs9wCEfhEJWYn/A8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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